[英]EF5 Database Migrations: How to move data
我首先使用EF5代码,现在我需要更新数据库,因此我启用了数据库迁移并添加了迁移,但是生成的代码不是我所需要的。 这是代码:
public override void Up()
{
CreateTable(
"dbo.HistoricalWeightEntities",
c => new
{
PatientMedicalDataId = c.Guid(nullable: false),
Id = c.Guid(nullable: false),
Weight = c.Single(nullable: false),
Date = c.DateTime(nullable: false),
})
.PrimaryKey(t => new { t.PatientMedicalDataId, t.Id })
.ForeignKey("dbo.PatientMedicalDataEntities", t => t.PatientMedicalDataId, cascadeDelete: true)
.Index(t => t.PatientMedicalDataId);
AddColumn("dbo.PatientDataEntities", "PatientDataFilePath", c => c.String());
//Here I need to move data from the old Weight column to the Weight column on the newly
//created table and create the id (Guid) and the foreing key before the old
//column is dropped
DropColumn("dbo.PatientMedicalDataEntities", "Weight");
}
我需要做的是添加一些sql脚本,将数据从dbo.PatientMedicalDataEntities的“ Weight”列移动到新创建的表dbo.HistoricalWeightEntities的Weight列中,并插入作为Guid的Id值(键)以及删除该列之前的相应外键。 有人可以告诉我如何使用sql吗?
先感谢您
它应该是这样的(不要知道您要使用“日期”列做什么)
Sql("INSERT INTO HistoricalWeightEntities(Id, Weight, PatientMedicalDataId) "+
"SELECT newid(), Weight, <theForeignKeyColumn> from PatientMedicalDataEntities");
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.